diff --git a/analyze/pubspec.lock b/analyze/pubspec.lock
index fcda3d0..369f8b9 100644
--- a/analyze/pubspec.lock
+++ b/analyze/pubspec.lock
@@ -125,10 +125,10 @@
     dependency: transitive
     description:
       name: glob
-      sha256: c51b4fdfee4d281f49b8c957f1add91b815473597f76bcf07377987f66a55729
+      sha256: "4515b5b6ddb505ebdd242a5f2cc5d22d3d6a80013789debfbda7777f47ea308c"
       url: "https://pub.dev"
     source: hosted
-    version: "2.1.0"
+    version: "2.1.1"
   logging:
     dependency: transitive
     description:
@@ -173,10 +173,10 @@
     dependency: "direct main"
     description:
       name: path
-      sha256: db9d4f58c908a4ba5953fcee2ae317c94889433e5024c27ce74a37f94267945b
+      sha256: "8829d8a55c13fc0e37127c29fedf290c102f4e40ae94ada574091fe0ff96c917"
       url: "https://pub.dev"
     source: hosted
-    version: "1.8.2"
+    version: "1.8.3"
   platform:
     dependency: "direct main"
     description:
@@ -189,10 +189,10 @@
     dependency: transitive
     description:
       name: pub_semver
-      sha256: b959af0a045c3484c4a8f4997731f5bfe4cac60d732fd8ce35b351f2d6a459fe
+      sha256: "307de764d305289ff24ad257ad5c5793ce56d04947599ad68b3baa124105fc17"
       url: "https://pub.dev"
     source: hosted
-    version: "2.1.2"
+    version: "2.1.3"
   source_gen:
     dependency: transitive
     description:
diff --git a/analyze/pubspec.yaml b/analyze/pubspec.yaml
index 1fe143a..74bcd4b 100644
--- a/analyze/pubspec.yaml
+++ b/analyze/pubspec.yaml
@@ -3,7 +3,7 @@
 publish_to: none
 
 environment:
-  sdk: ">=2.12.0 <3.0.0"
+  sdk: ">=2.18.0 <4.0.0"
 
 dependencies:
   file: ^6.1.2
diff --git a/app_dart/pubspec.yaml b/app_dart/pubspec.yaml
index bdbf56e..dcd383e 100644
--- a/app_dart/pubspec.yaml
+++ b/app_dart/pubspec.yaml
@@ -8,7 +8,7 @@
 publish_to: none
 
 environment:
-  sdk: '>=2.19.0-0 <3.0.0'
+  sdk: '>=2.19.0-0 <4.0.0'
 
 dependencies:
   appengine: ^0.13.4
diff --git a/auto_submit/pubspec.yaml b/auto_submit/pubspec.yaml
index 0eedbd4..be75329 100644
--- a/auto_submit/pubspec.yaml
+++ b/auto_submit/pubspec.yaml
@@ -8,7 +8,7 @@
 homepage: https://github.com/flutter/cocoon/blob/main/autosubmit
 
 environment:
-  sdk: '>=2.17.0 <3.0.0'
+  sdk: '>=2.18.0 <4.0.0'
 
 dependencies:
   appengine: ^0.13.4
diff --git a/codesign/pubspec.yaml b/codesign/pubspec.yaml
index bfdddc7..72b5b5d 100644
--- a/codesign/pubspec.yaml
+++ b/codesign/pubspec.yaml
@@ -4,7 +4,7 @@
 homepage: https://github.com/flutter/cocoon
 
 environment:
-  sdk: '>=2.17.0-266.1.beta <3.0.0'
+  sdk: '>=2.18.0 <4.0.0'
 
 dev_dependencies:
   lints: ^2.0.0
diff --git a/dashboard/pubspec.lock b/dashboard/pubspec.lock
index c37f750..acc53c6 100644
--- a/dashboard/pubspec.lock
+++ b/dashboard/pubspec.lock
@@ -29,18 +29,18 @@
     dependency: transitive
     description:
       name: async
-      sha256: bfe67ef28df125b7dddcea62755991f807aa39a2492a23e1550161692950bbe0
+      sha256: "271b8899fc99f9df4f4ed419fa14e2fff392c7b2c162fbb87b222e2e963ddc73"
       url: "https://pub.dev"
     source: hosted
-    version: "2.10.0"
+    version: "2.9.0"
   boolean_selector:
     dependency: transitive
     description:
       name: boolean_selector
-      sha256: "6cfb5af12253eaf2b368f07bacc5a80d1301a071c73360d746b7f2e32d762c66"
+      sha256: "5bbf32bc9e518d41ec49718e2931cd4527292c9b0c6d2dffcf7fe6b9a8a8cf72"
       url: "https://pub.dev"
     source: hosted
-    version: "2.1.1"
+    version: "2.1.0"
   build:
     dependency: transitive
     description:
@@ -141,10 +141,10 @@
     dependency: "direct main"
     description:
       name: collection
-      sha256: cfc915e6923fe5ce6e153b0723c753045de46de1b4d63771530504004a45fae0
+      sha256: ef7e3a5529178ce8f37a9d0b11cbbc8b1e025940f9cf9f76c42da6796301219d
       url: "https://pub.dev"
     source: hosted
-    version: "1.17.0"
+    version: "1.16.0"
   convert:
     dependency: transitive
     description:
@@ -324,10 +324,10 @@
     dependency: transitive
     description:
       name: js
-      sha256: "5528c2f391ededb7775ec1daa69e65a2d61276f7552de2b5f7b8d34ee9fd4ab7"
+      sha256: a5e201311cb08bf3912ebbe9a2be096e182d703f881136ec1e81a2338a9e120d
       url: "https://pub.dev"
     source: hosted
-    version: "0.6.5"
+    version: "0.6.4"
   json_annotation:
     dependency: transitive
     description:
@@ -356,10 +356,10 @@
     dependency: transitive
     description:
       name: matcher
-      sha256: "16db949ceee371e9b99d22f88fa3a73c4e59fd0afed0bd25fc336eb76c198b72"
+      sha256: "80c2989398773fa06e2457e9ff08580f24e9858b28462a722241cb53e5613478"
       url: "https://pub.dev"
     source: hosted
-    version: "0.12.13"
+    version: "0.12.12"
   material_color_utilities:
     dependency: transitive
     description:
@@ -513,10 +513,10 @@
     dependency: transitive
     description:
       name: stack_trace
-      sha256: c3c7d8edb15bee7f0f74debd4b9c5f3c2ea86766fe4178eb2a18eb30a0bdaed5
+      sha256: f8d9f247e2f9f90e32d1495ff32dac7e4ae34ffa7194c5ff8fcc0fd0e52df774
       url: "https://pub.dev"
     source: hosted
-    version: "1.11.0"
+    version: "1.10.0"
   stream_channel:
     dependency: transitive
     description:
@@ -553,10 +553,10 @@
     dependency: transitive
     description:
       name: test_api
-      sha256: c9aba3b3dbfe8878845dfab5fa096eb8de7b62231baeeb1cea8e3ee81ca8c6d8
+      sha256: ceeddf59d613e862e77f4b506cfc2945ac9637ce0b4c00f4f4c1ac639f3e9731
       url: "https://pub.dev"
     source: hosted
-    version: "0.4.15"
+    version: "0.4.14"
   timing:
     dependency: transitive
     description:
diff --git a/dashboard/pubspec.yaml b/dashboard/pubspec.yaml
index 2efb67c..b5630b5 100644
--- a/dashboard/pubspec.yaml
+++ b/dashboard/pubspec.yaml
@@ -19,7 +19,7 @@
 version: 1.0.0+1
 
 environment:
-  sdk: '>=2.17.0 <3.0.0'
+  sdk: '>=2.18.0 <4.0.0'
 
 dependencies:
   collection: ^1.16.0
diff --git a/device_doctor/pubspec.lock b/device_doctor/pubspec.lock
index 548ac72..26eecdf 100644
--- a/device_doctor/pubspec.lock
+++ b/device_doctor/pubspec.lock
@@ -197,18 +197,18 @@
     dependency: transitive
     description:
       name: frontend_server_client
-      sha256: "82715f8041a85a534a7bf64400b2ee0bb3d594ccf695d97c0bb017259657ff5d"
+      sha256: "408e3ca148b31c20282ad6f37ebfa6f4bdc8fede5b74bc2f08d9d92b55db3612"
       url: "https://pub.dev"
     source: hosted
-    version: "3.1.0"
+    version: "3.2.0"
   glob:
     dependency: transitive
     description:
       name: glob
-      sha256: c51b4fdfee4d281f49b8c957f1add91b815473597f76bcf07377987f66a55729
+      sha256: "4515b5b6ddb505ebdd242a5f2cc5d22d3d6a80013789debfbda7777f47ea308c"
       url: "https://pub.dev"
     source: hosted
-    version: "2.1.0"
+    version: "2.1.1"
   graphs:
     dependency: transitive
     description:
@@ -285,10 +285,10 @@
     dependency: transitive
     description:
       name: mime
-      sha256: dab22e92b41aa1255ea90ddc4bc2feaf35544fd0728e209638cad041a6e3928a
+      sha256: "52e38f7e1143ef39daf532117d6b8f8f617bf4bcd6044ed8c29040d20d269630"
       url: "https://pub.dev"
     source: hosted
-    version: "1.0.2"
+    version: "1.0.3"
   mockito:
     dependency: "direct dev"
     description:
@@ -317,10 +317,10 @@
     dependency: "direct main"
     description:
       name: path
-      sha256: db9d4f58c908a4ba5953fcee2ae317c94889433e5024c27ce74a37f94267945b
+      sha256: "8829d8a55c13fc0e37127c29fedf290c102f4e40ae94ada574091fe0ff96c917"
       url: "https://pub.dev"
     source: hosted
-    version: "1.8.2"
+    version: "1.8.3"
   platform:
     dependency: transitive
     description:
@@ -349,10 +349,10 @@
     dependency: transitive
     description:
       name: pub_semver
-      sha256: b959af0a045c3484c4a8f4997731f5bfe4cac60d732fd8ce35b351f2d6a459fe
+      sha256: "307de764d305289ff24ad257ad5c5793ce56d04947599ad68b3baa124105fc17"
       url: "https://pub.dev"
     source: hosted
-    version: "2.1.2"
+    version: "2.1.3"
   pubspec_parse:
     dependency: transitive
     description:
@@ -397,10 +397,10 @@
     dependency: transitive
     description:
       name: shelf_web_socket
-      sha256: "6db16374bc3497d21aa0eebe674d3db9fdf82082aac0f04dc7b44e4af5b08afc"
+      sha256: a988c0e8d8ffbdb8a28aa7ec8e449c260f3deb808781fe1284d22c5bba7156e8
       url: "https://pub.dev"
     source: hosted
-    version: "1.0.2"
+    version: "1.0.3"
   source_gen:
     dependency: transitive
     description:
@@ -453,10 +453,10 @@
     dependency: transitive
     description:
       name: stream_transform
-      sha256: f1d172e22a5432c042b5adfa9aff621372e4292231d9d73ad00f486ad01c2395
+      sha256: "14a00e794c7c11aa145a170587321aedce29769c08d7f58b1d141da75e3b1c6f"
       url: "https://pub.dev"
     source: hosted
-    version: "2.0.1"
+    version: "2.1.0"
   string_scanner:
     dependency: transitive
     description:
diff --git a/device_doctor/pubspec.yaml b/device_doctor/pubspec.yaml
index 4b0ea6e..e50dcc3 100644
--- a/device_doctor/pubspec.yaml
+++ b/device_doctor/pubspec.yaml
@@ -3,7 +3,7 @@
 version: 1.0.1
 
 environment:
-  sdk: ">=2.12.0 <3.0.0"
+  sdk: ">=2.18.0 <4.0.0"
 
 dependencies:
   analyzer: ">=2.3.0 <6.0.0"
diff --git a/device_doctor/test/src/fake_ios_device.dart b/device_doctor/test/src/fake_ios_device.dart
index cb93407..dd7bfcb 100644
--- a/device_doctor/test/src/fake_ios_device.dart
+++ b/device_doctor/test/src/fake_ios_device.dart
@@ -3,13 +3,13 @@
 // found in the LICENSE file.
 
 import 'dart:async';
-import 'dart:io';
 
 import 'package:device_doctor/src/ios_device.dart';
 import 'package:process/process.dart';
 
 class FakeIosDeviceDiscovery extends IosDeviceDiscovery {
-  FakeIosDeviceDiscovery(File output) : super.testing(output);
+  // ignore: use_super_parameters
+  FakeIosDeviceDiscovery(output) : super.testing(output);
 
   List<dynamic>? _outputs;
   int _pos = 0;
diff --git a/licenses/pubspec.lock b/licenses/pubspec.lock
index 09340cf..2ffec04 100644
--- a/licenses/pubspec.lock
+++ b/licenses/pubspec.lock
@@ -5,239 +5,273 @@
     dependency: transitive
     description:
       name: _fe_analyzer_shared
-      url: "https://pub.dartlang.org"
+      sha256: "3444216bfd127af50bbe4862d8843ed44db946dd933554f0d7285e89f10e28ac"
+      url: "https://pub.dev"
     source: hosted
     version: "50.0.0"
   analyzer:
     dependency: transitive
     description:
       name: analyzer
-      url: "https://pub.dartlang.org"
+      sha256: "68796c31f510c8455a06fed75fc97d8e5ad04d324a830322ab3efc9feb6201c1"
+      url: "https://pub.dev"
     source: hosted
     version: "5.2.0"
   args:
     dependency: transitive
     description:
       name: args
-      url: "https://pub.dartlang.org"
+      sha256: b003c3098049a51720352d219b0bb5f219b60fbfb68e7a4748139a06a5676515
+      url: "https://pub.dev"
     source: hosted
     version: "2.3.1"
   async:
     dependency: transitive
     description:
       name: async
-      url: "https://pub.dartlang.org"
+      sha256: bfe67ef28df125b7dddcea62755991f807aa39a2492a23e1550161692950bbe0
+      url: "https://pub.dev"
     source: hosted
     version: "2.10.0"
   boolean_selector:
     dependency: transitive
     description:
       name: boolean_selector
-      url: "https://pub.dartlang.org"
+      sha256: "6cfb5af12253eaf2b368f07bacc5a80d1301a071c73360d746b7f2e32d762c66"
+      url: "https://pub.dev"
     source: hosted
     version: "2.1.1"
   build:
     dependency: transitive
     description:
       name: build
-      url: "https://pub.dartlang.org"
+      sha256: "3fbda25365741f8251b39f3917fb3c8e286a96fd068a5a242e11c2012d495777"
+      url: "https://pub.dev"
     source: hosted
     version: "2.3.1"
   built_collection:
     dependency: transitive
     description:
       name: built_collection
-      url: "https://pub.dartlang.org"
+      sha256: "376e3dd27b51ea877c28d525560790aee2e6fbb5f20e2f85d5081027d94e2100"
+      url: "https://pub.dev"
     source: hosted
     version: "5.1.1"
   built_value:
     dependency: transitive
     description:
       name: built_value
-      url: "https://pub.dartlang.org"
+      sha256: "59e08b0079bb75f7e27392498e26339387c1089c6bd58525a14eb8508637277b"
+      url: "https://pub.dev"
     source: hosted
     version: "8.4.2"
   code_builder:
     dependency: transitive
     description:
       name: code_builder
-      url: "https://pub.dartlang.org"
+      sha256: "02ce3596b459c666530f045ad6f96209474e8fee6e4855940a3cee65fb872ec5"
+      url: "https://pub.dev"
     source: hosted
     version: "4.3.0"
   collection:
     dependency: transitive
     description:
       name: collection
-      url: "https://pub.dartlang.org"
+      sha256: cfc915e6923fe5ce6e153b0723c753045de46de1b4d63771530504004a45fae0
+      url: "https://pub.dev"
     source: hosted
     version: "1.17.0"
   convert:
     dependency: transitive
     description:
       name: convert
-      url: "https://pub.dartlang.org"
+      sha256: "0f08b14755d163f6e2134cb58222dd25ea2a2ee8a195e53983d57c075324d592"
+      url: "https://pub.dev"
     source: hosted
     version: "3.1.1"
   crypto:
     dependency: transitive
     description:
       name: crypto
-      url: "https://pub.dartlang.org"
+      sha256: aa274aa7774f8964e4f4f38cc994db7b6158dd36e9187aaceaddc994b35c6c67
+      url: "https://pub.dev"
     source: hosted
     version: "3.0.2"
   dart_style:
     dependency: transitive
     description:
       name: dart_style
-      url: "https://pub.dartlang.org"
+      sha256: "7a03456c3490394c8e7665890333e91ae8a49be43542b616e414449ac358acd4"
+      url: "https://pub.dev"
     source: hosted
     version: "2.2.4"
   file:
     dependency: transitive
     description:
       name: file
-      url: "https://pub.dartlang.org"
+      sha256: "1b92bec4fc2a72f59a8e15af5f52cd441e4a7860b49499d69dfa817af20e925d"
+      url: "https://pub.dev"
     source: hosted
     version: "6.1.4"
   fixnum:
     dependency: transitive
     description:
       name: fixnum
-      url: "https://pub.dartlang.org"
+      sha256: "04be3e934c52e082558cc9ee21f42f5c1cd7a1262f4c63cd0357c08d5bba81ec"
+      url: "https://pub.dev"
     source: hosted
     version: "1.0.1"
   glob:
     dependency: transitive
     description:
       name: glob
-      url: "https://pub.dartlang.org"
+      sha256: "4515b5b6ddb505ebdd242a5f2cc5d22d3d6a80013789debfbda7777f47ea308c"
+      url: "https://pub.dev"
     source: hosted
     version: "2.1.1"
   logging:
     dependency: transitive
     description:
       name: logging
-      url: "https://pub.dartlang.org"
+      sha256: c0bbfe94d46aedf9b8b3e695cf3bd48c8e14b35e3b2c639e0aa7755d589ba946
+      url: "https://pub.dev"
     source: hosted
     version: "1.1.0"
   matcher:
     dependency: transitive
     description:
       name: matcher
-      url: "https://pub.dartlang.org"
+      sha256: "16db949ceee371e9b99d22f88fa3a73c4e59fd0afed0bd25fc336eb76c198b72"
+      url: "https://pub.dev"
     source: hosted
     version: "0.12.13"
   meta:
     dependency: transitive
     description:
       name: meta
-      url: "https://pub.dartlang.org"
+      sha256: "6c268b42ed578a53088d834796959e4a1814b5e9e164f147f580a386e5decf42"
+      url: "https://pub.dev"
     source: hosted
     version: "1.8.0"
   mockito:
     dependency: "direct dev"
     description:
       name: mockito
-      url: "https://pub.dartlang.org"
+      sha256: "2a8a17b82b1bde04d514e75d90d634a0ac23f6cb4991f6098009dd56836aeafe"
+      url: "https://pub.dev"
     source: hosted
     version: "5.3.2"
   package_config:
     dependency: transitive
     description:
       name: package_config
-      url: "https://pub.dartlang.org"
+      sha256: "1c5b77ccc91e4823a5af61ee74e6b972db1ef98c2ff5a18d3161c982a55448bd"
+      url: "https://pub.dev"
     source: hosted
     version: "2.1.0"
   path:
     dependency: "direct main"
     description:
       name: path
-      url: "https://pub.dartlang.org"
+      sha256: "8829d8a55c13fc0e37127c29fedf290c102f4e40ae94ada574091fe0ff96c917"
+      url: "https://pub.dev"
     source: hosted
     version: "1.8.3"
   platform:
     dependency: "direct main"
     description:
       name: platform
-      url: "https://pub.dartlang.org"
+      sha256: "4a451831508d7d6ca779f7ac6e212b4023dd5a7d08a27a63da33756410e32b76"
+      url: "https://pub.dev"
     source: hosted
     version: "3.1.0"
   pub_semver:
     dependency: transitive
     description:
       name: pub_semver
-      url: "https://pub.dartlang.org"
+      sha256: "307de764d305289ff24ad257ad5c5793ce56d04947599ad68b3baa124105fc17"
+      url: "https://pub.dev"
     source: hosted
     version: "2.1.3"
   source_gen:
     dependency: transitive
     description:
       name: source_gen
-      url: "https://pub.dartlang.org"
+      sha256: "2d79738b6bbf38a43920e2b8d189e9a3ce6cc201f4b8fc76be5e4fe377b1c38d"
+      url: "https://pub.dev"
     source: hosted
     version: "1.2.6"
   source_span:
     dependency: transitive
     description:
       name: source_span
-      url: "https://pub.dartlang.org"
+      sha256: dd904f795d4b4f3b870833847c461801f6750a9fa8e61ea5ac53f9422b31f250
+      url: "https://pub.dev"
     source: hosted
     version: "1.9.1"
   stack_trace:
     dependency: transitive
     description:
       name: stack_trace
-      url: "https://pub.dartlang.org"
+      sha256: c3c7d8edb15bee7f0f74debd4b9c5f3c2ea86766fe4178eb2a18eb30a0bdaed5
+      url: "https://pub.dev"
     source: hosted
     version: "1.11.0"
   stream_channel:
     dependency: transitive
     description:
       name: stream_channel
-      url: "https://pub.dartlang.org"
+      sha256: "83615bee9045c1d322bbbd1ba209b7a749c2cbcdcb3fdd1df8eb488b3279c1c8"
+      url: "https://pub.dev"
     source: hosted
     version: "2.1.1"
   string_scanner:
     dependency: transitive
     description:
       name: string_scanner
-      url: "https://pub.dartlang.org"
+      sha256: "556692adab6cfa87322a115640c11f13cb77b3f076ddcc5d6ae3c20242bedcde"
+      url: "https://pub.dev"
     source: hosted
     version: "1.2.0"
   term_glyph:
     dependency: transitive
     description:
       name: term_glyph
-      url: "https://pub.dartlang.org"
+      sha256: a29248a84fbb7c79282b40b8c72a1209db169a2e0542bce341da992fe1bc7e84
+      url: "https://pub.dev"
     source: hosted
     version: "1.2.1"
   test_api:
     dependency: "direct dev"
     description:
       name: test_api
-      url: "https://pub.dartlang.org"
+      sha256: ad540f65f92caa91bf21dfc8ffb8c589d6e4dc0c2267818b4cc2792857706206
+      url: "https://pub.dev"
     source: hosted
     version: "0.4.16"
   typed_data:
     dependency: transitive
     description:
       name: typed_data
-      url: "https://pub.dartlang.org"
+      sha256: "26f87ade979c47a150c9eaab93ccd2bebe70a27dc0b4b29517f2904f04eb11a5"
+      url: "https://pub.dev"
     source: hosted
     version: "1.3.1"
   watcher:
     dependency: transitive
     description:
       name: watcher
-      url: "https://pub.dartlang.org"
+      sha256: "6a7f46926b01ce81bfc339da6a7f20afbe7733eff9846f6d6a5466aa4c6667c0"
+      url: "https://pub.dev"
     source: hosted
     version: "1.0.2"
   yaml:
     dependency: transitive
     description:
       name: yaml
-      url: "https://pub.dartlang.org"
+      sha256: "23812a9b125b48d4007117254bca50abb6c712352927eece9e155207b1db2370"
+      url: "https://pub.dev"
     source: hosted
     version: "3.1.1"
 sdks:
-  dart: ">=2.18.0 <3.0.0"
+  dart: ">=2.18.0 <4.0.0"
diff --git a/licenses/pubspec.yaml b/licenses/pubspec.yaml
index 8768f68..e4bad55 100644
--- a/licenses/pubspec.yaml
+++ b/licenses/pubspec.yaml
@@ -2,7 +2,7 @@
 description: Script to check licenses.
 
 environment:
-  sdk: ">=2.12.0 <3.0.0"
+  sdk: ">=2.18.0 <4.0.0"
 
 dependencies:
   path: ^1.8.3
diff --git a/packages/buildbucket-dart/CHANGELOG.md b/packages/buildbucket-dart/CHANGELOG.md
index f7f1d52..b24b757 100644
--- a/packages/buildbucket-dart/CHANGELOG.md
+++ b/packages/buildbucket-dart/CHANGELOG.md
@@ -1,3 +1,8 @@
+# 1.0.1
+
+- Update required Dart revisions for sound null safety
+
+
 # 1.0.0
 
 - Initial version generating dart code for Buildbucket protos.
diff --git a/packages/buildbucket-dart/pubspec.yaml b/packages/buildbucket-dart/pubspec.yaml
index bedd3e0..8fc64ac 100644
--- a/packages/buildbucket-dart/pubspec.yaml
+++ b/packages/buildbucket-dart/pubspec.yaml
@@ -1,10 +1,10 @@
 name: buildbucket
 description: LUCI Buildbucket library. Protos and utilities to communicate with LUCI buildbucket service.
-version: 1.0.0
+version: 1.0.1
 repository: https://github.com/flutter/cocoon/tree/main/packages/buildbucket-dart
 
 environment:
-  sdk: ">=2.12.0 <3.0.0"
+  sdk: ">=2.18.0 <4.0.0"
 
 dependencies:
   protoc_plugin: ^20.0.1
diff --git a/test_utilities/pubspec.lock b/test_utilities/pubspec.lock
index 59e65cf..cb4789e 100644
--- a/test_utilities/pubspec.lock
+++ b/test_utilities/pubspec.lock
@@ -5,50 +5,57 @@
     dependency: "direct dev"
     description:
       name: args
-      url: "https://pub.dartlang.org"
+      sha256: b003c3098049a51720352d219b0bb5f219b60fbfb68e7a4748139a06a5676515
+      url: "https://pub.dev"
     source: hosted
     version: "2.3.1"
   collection:
     dependency: transitive
     description:
       name: collection
-      url: "https://pub.dartlang.org"
+      sha256: cfc915e6923fe5ce6e153b0723c753045de46de1b4d63771530504004a45fae0
+      url: "https://pub.dev"
     source: hosted
     version: "1.17.0"
   path:
     dependency: "direct dev"
     description:
       name: path
-      url: "https://pub.dartlang.org"
+      sha256: "8829d8a55c13fc0e37127c29fedf290c102f4e40ae94ada574091fe0ff96c917"
+      url: "https://pub.dev"
     source: hosted
     version: "1.8.3"
   source_span:
     dependency: transitive
     description:
       name: source_span
-      url: "https://pub.dartlang.org"
+      sha256: dd904f795d4b4f3b870833847c461801f6750a9fa8e61ea5ac53f9422b31f250
+      url: "https://pub.dev"
     source: hosted
     version: "1.9.1"
   string_scanner:
     dependency: transitive
     description:
       name: string_scanner
-      url: "https://pub.dartlang.org"
+      sha256: "556692adab6cfa87322a115640c11f13cb77b3f076ddcc5d6ae3c20242bedcde"
+      url: "https://pub.dev"
     source: hosted
     version: "1.2.0"
   term_glyph:
     dependency: transitive
     description:
       name: term_glyph
-      url: "https://pub.dartlang.org"
+      sha256: a29248a84fbb7c79282b40b8c72a1209db169a2e0542bce341da992fe1bc7e84
+      url: "https://pub.dev"
     source: hosted
     version: "1.2.1"
   yaml:
     dependency: "direct dev"
     description:
       name: yaml
-      url: "https://pub.dartlang.org"
+      sha256: "23812a9b125b48d4007117254bca50abb6c712352927eece9e155207b1db2370"
+      url: "https://pub.dev"
     source: hosted
     version: "3.1.1"
 sdks:
-  dart: ">=2.18.0 <3.0.0"
+  dart: ">=2.18.0 <4.0.0"
diff --git a/test_utilities/pubspec.yaml b/test_utilities/pubspec.yaml
index d929640..d44e737 100644
--- a/test_utilities/pubspec.yaml
+++ b/test_utilities/pubspec.yaml
@@ -7,7 +7,7 @@
 homepage: https://github.com/flutter/cocoon
 
 environment:
-  sdk: '>=2.2.0'
+  sdk: '>=2.18.0 < 4.0.0'
 
 dev_dependencies:
   args: ^2.3.1